United Airlines Primary Aircraft – B737-700 (73G) Practice Test

In an in-flight emergency the interphone serves as a direct, two-way link between the cockpit and cabin crew. This private line lets the captain and flight attendants quickly exchange critical information, issue instructions, and confirm actions without crowding the cabin or needing to involve ground personnel. The goal is to keep everyone aligned and responsive as the situation develops, such as coordinating the use of emergency equipment, confirming patient status, and assigning tasks to crew members.

The other options aren’t the primary use of the interphone: meals are arranged through galley systems, not the interphone; contacting ground personnel is done through other radio or external communication channels; and recording flight data is handled by the aircraft’s flight data recording systems, not the interphone.